B Series Truck 4WD L4-2606cc 2.6L SOHC (1992)
Air Conditioning Switch: Testing and Inspection
Switch and Wiring Check
The A/C switch signal can be checked at ECU terminal 1Q. With blower motor and ignition switches "ON," terminal voltage should read below 2.5V
with A/C switch "ON" and approximately 12V with A/C switch "OFF."
For further A/C system information, refer to HEATING, VENTILATION AND AIR CONDITIONING.